<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    
</body>
</html>
<script>
    (function(){
        function Tank(){
            this.dom = null;
            this.speed = 0;
            this.color = '';
            this.run = function(){}
        }
        var instance = null;
        function getInstange(){
            return instance || (instance = new Tank())
        }
        window.SingleTon = {getInstange}
    })()
    var a = SingleTon.getInstange();
    var b = SingleTon.getInstange();
    var c = SingleTon.getInstange();

    console.log(a,b,c);
    console.log(a==b);
    console.log(a==c);
    console.log(b==c);
</script>